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B Why is sin(3.6) *Negative*?

  1. Dec 18, 2016 #1
    Why is sin(3.6) Negative? Why is sin(3.6) negative? It makes no sense. It should be positive between -90 and 90 degrees.
    Last edited by a moderator: Dec 22, 2016
  2. jcsd
  3. Dec 18, 2016 #2


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    It makes sense if 3.6 is in radian.
  4. Dec 18, 2016 #3


    Staff: Mentor

    sin(3.6°) > -0, but 3.6 by itself is considered to be in radian measure.

    Also,if x is between -90° and 0°, sin(x) is negative.
  5. Dec 19, 2016 #4
    Thank you Mark44.
  6. Dec 22, 2016 #5
    Because, π<3.6<3π/2 ... 3.6 radians lies in quadrant III where sine values are negative.
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